<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        {
            let name = "张三" ;
            let age = 23 ;
            let obj = {
                name,
                age,
                fn(){
                    console.log("fn");
                }
            }
            console.log(obj);
            obj.fn();
        }
        {
            let username = "name"  ;
            let obj = {
                [username]: "张三" ,
                age:25
            }
            console.log(obj);
        }
    </script>
</body>
</html>